How to manage your content in Joomla is explained in this tutorial. You'll also learn how to use various filters.
This video shows you how you can use it to adjust multiple properties all at once.
Adding an Article ( Page )
This Joomla Tutorial will walk you through adding new content to your website by way of a new article
Adding an Category
Add a Category in Joomla
Creating a Category Blog
Creating a Category Blog in Joomla
Explore the Menu Manager in Joomla
Adding an Menu Item
Add a Menu Item
Explore the Module Manager in Joomla